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  <title>Document</title>
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  <style>
    div>div {
      width: 100px;
      height: 100px;
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    .solid {
      /*
        边框样式
         ● solid
         ● dashed
         ● dotted
         ● double
       */
      border-style: solid;
    }

    .dashed {
      border-style: dashed;
    }

    .dotted {
      border-style: dotted;
    }

    .double {
      border-style: double;
    }
  </style>
</head>

<body>
  <div class="float-left margin-left-10">
    <p class="title">solid</p>
    <div class="solid"></div>
  </div>

  <div class="float-left margin-left-10">
    <p class="title">dashed</p>
    <div class="dashed"></div>
  </div>

  <div class="float-left margin-left-10">
    <p class="title">dotted</p>
    <div class="dotted"></div>
  </div>

  <div class="float-left margin-left-10">
    <p class="title">double</p>
    <div class="double"></div>
  </div>
</body>

</html>